$(list_categories | while read cat; do
printf '[label [checkbox "filter_cat%i" "|%s" %s] %s ] ' \
"$n" "$(HTML "$cat")" \
"$(printf %s "$cat" |grep -qxEe "$2" && printf checked )" \
"$(HTML "$cat")"
done)
$(list_categories | while read cat; do
printf '[label [checkbox "filter_cat%i" "|%s" %s] %s ] ' \
"$n" "$(HTML "$cat")" \
"$(printf %s "$cat" |grep -qxEe "$2" && printf checked )" \
"$(HTML "$cat")"
done)